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Coldcard entropy bug renews push for multi-vendor Bitcoin multisig
The article says the bug was not discovered for years and traces how it is reshaping self-custody practices, including potential shifts away from relying on a single hardware wallet.
Bitcoin Magazine reports that a catastrophic entropy bug at Coldcard has prompted renewed debate over self-custody practices, with experts increasingly recommending multi-vendor multisignature setups to reduce dependence on any single hardware wallet manufacturer.
The piece says the Coldcard entropy issue went undiscovered since at least 2021, and links the lesson to ongoing concerns that even widely recommended wallet providers can still have major flaws that affect key generation.
It notes that bitcoin owners are revaluating custody decisions after the July to August 2026 thefts, including some moving coins to exchanges temporarily and others upgrading or changing self-custody configurations.
Bitcoin Magazine also highlights Casa CEO Nick Neuman's claim that 233k bitcoins moved to safety in reaction to the Coldcard hack, and emphasizes the need for users to build a threat model to decide what custody approach best fits their specific risks.
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